Kelly Rowland tells People magazine in its March 17 issue that she had plastic surgery last October to bring her "from an A-cup to a B-cup."

As for the one-cup upgrade, Rowland says: "I didn't want to have double Ds and be a little bitty size 2 — that would look nuts!"

The 27-year-old singer went under the knife after a long decision-making process.

"I was sick of not fitting into my tops," she says. "There was this one really hot House of Dereon top — I just wanted to fill that out!"

Rowland says that top — designed by Beyonce's mom, Tina Knowles — complements her new curves: "I put it on and I looked so good! I'm so happy. I feel complete."

Rowland, who has released two solo albums, says she hesitated to discuss the surgery.

"It is a decision I made for myself. I like it, and that's all that counts. For young people: Think about it before you just jump off and do something (you may regret later)," she says.